update-ref: -d flag and ref creation safety.
authorJunio C Hamano <junkio@cox.net>
Wed, 27 Sep 2006 08:58:57 +0000 (01:58 -0700)
committerJunio C Hamano <junkio@cox.net>
Wed, 27 Sep 2006 09:01:42 +0000 (02:01 -0700)
commitac5409e420e5fdd7c4a381f873ffcedfb83d7117
treeeae6bec434639c43b324005b5c0b88bfe5889834
parent4431fcc4b134ae501e3e57dc568ae4f031e57898
update-ref: -d flag and ref creation safety.

This adds -d flag to update-ref to allow safe deletion of ref.
Before deleting it, the command checks if the given <oldvalue>
still matches the value the caller thought the ref contained.

Similarly, it also accepts 0{40} or an empty string as <oldvalue>
to allow safe creation of a new ref.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Documentation/git-update-ref.txt
builtin-update-ref.c
cache.h
refs.c